package com.cty.kafka.sample;

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;

import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

/**
 * ConsumerQuickStart
 *
 * @author tianyuchan
 * @since 2024/7/10
 */

public class ConsumerQuickStartGroup1_01 {

    public static void main(String[] args) {
        //1.添加kafka的配置信息
        Properties properties = new Properties();
        //kafka的连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "101.42.44.206:9092");
        //消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "group1");
        //消息的反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        //关闭自动提交偏移量
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);

        //2.消费者对象
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(properties);

        //3.订阅主题
        consumer.subscribe(Collections.singletonList("itheima-topic"));

        //当前线程一直处于监听状态
        try {
            while (true) {
                //4.获取消息
                ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                    System.out.println("-------------------接收消息-------------------");
                    System.out.println("partition = " + consumerRecord.partition());
                    System.out.println("offset = " + consumerRecord.offset());
                    System.out.println("key = " + consumerRecord.key());
                    System.out.println("value = " + consumerRecord.value());
                    // 同步提交偏移量
//                try {
//                    consumer.commitSync();//同步提交当前最新的偏移量
//                }catch (CommitFailedException e){
//                    System.out.println("记录提交失败的异常："+e);
//                }
                }
                // 异步提交偏移量
                consumer.commitAsync(new OffsetCommitCallback() {
                    @Override
                    public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
                        if (e != null) {
                            System.out.println("记录错误的提交偏移量：" + map + ",异常信息" + e);
                        }
                    }
                });
            }  //end while
        } catch (Exception e){
            e.printStackTrace();
            System.out.println("记录错误信息："+e);
        }finally {
            try {
                // 出现异常后同步提交
                consumer.commitSync();
            }finally {
                consumer.close();
            }
        }

    }  //end main

}
